Karnak, i was'nt talking about driving all the way from an actual vehicle hangar.
Lets say A11 was under attack by vehicles, and the vh was down. A15, A14, V40, and V41 all have vehicle spawn points very close to A11. Unless all those bases are disabled or enemy-controlled, u can spawn a vehicle close to A11 and drive there in less than 5 minutes, just like the attackers.
I havent checked all of them, but it looks like every non-elevated airbase is easily accessible by vehicles from 2 airbases and 2 v-bases.